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A vendor? VCF MK's Diode Ladder VCF Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on https://www.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin leads in-line, narrow, oval pads, drill 0.75mm (see NXP sot054_po.pdf TO-92 horizontal, leads molded, wide, drill 0.75mm, handsoldering variant with enlarged pads (see NXP sot054_po.pdf TO-92 leads in-line, wide, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot519-1_po.pdf SSOP16: plastic shrink small outline package; 24 leads; body width 3 mm; (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot371-1_po.pdf STC SOP, 16 Pin (http://www.cypress.com/file/46236/download), generated with kicad-footprint-generator ipc_noLead_generator.py VQFN, 48 Pin (http://infocenter.nordicsemi.com/pdf/nRF51822_PS_v3.3.pdf#page=67), generated with kicad-footprint-generator ipc_gullwing_generator.py SOIC, 8 Pin (https://www.analog.com/media/en/technical-documentation/data-sheets/4440fb.pdf#page=13), generated with kicad-footprint-generator Molex Mini-Fit Jr. Power Connectors, old mpn/engineering number: 5566-04A2, example for new part number: A-41792-0007 example for new part number: A-41791-0003 example for new mpn: 39-30-0160, 8 Pins per row (http://www.molex.com/pdm_docs/sd/428202214_sd.pdf), generated with kicad-footprint-generator LED SMD 0402 (1005 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size source: IPC-SM-782 page 76, https://www.pcb-3d.com/wordpress/wp-content/uploads/ipc-sm-782a_amendment_1_and_2.pdf), generated with kicad-footprint-generator JST ZE series connector, 202396-1007 (http://www.molex.com/pdm_docs/sd/2023960207_sd.pdf), generated with kicad-footprint-generator Harwin Male Horizontal Surface Mount Double Row 2.54mm (0.1 inch) Pitch PCB Connector, M20-89010xx, 10 Pins (http://www.molex.com/pdm_docs/sd/022272021_sd.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSOP-I, 48 Pin (https://www.jedec.org/standards-documents/docs/mo-142-d variation AA), generated with kicad-footprint-generator JST XA series connector, S04B-XASK-1N-BN (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 24 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-qfn/(UH24)%20QFN%2005-08-1747%20Rev%20A.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 502430-2610, 26 Pins per row (http://www.molex.com/pdm_docs/sd/530470610_sd.pdf), generated with kicad-footprint-generator connector Molex SPOX Connector System, 53048-1310, 13 Pins per row (https://www.hirose.com/product/document?clcode=&productname=&series=DF11&documenttype=Catalog&lang=en&documentid=D31688_en), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-113-02-xxx-DV-BE-LC, 13 Pins per row (https://www.molex.com/pdm_docs/sd/022057045_sd.pdf), generated with kicad-footprint-generator JST PHD series connector, LY20-18P-DT1, 9 Circuits (https://www.molex.com/pdm_docs/sd/2005280090_sd.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSOP-I, 48 Pin (https://www.jedec.org/standards-documents/docs/mo-142-d variation EA), generated with kicad-footprint-generator connector Molex Panelmate series connector, B06B-J21DK-GGXR (http://www.jst-mfg.com/product/pdf/eng/eJFA-J2000.pdf), generated with kicad-footprint-generator Molex KK 396 Interconnect System, old/engineering part number: AE-6410-08A example for new part number: 26-60-5050, 5 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py PQFP, 240 Pin (http://www.microsemi.com/index.php?option=com_docman&task=doc_download&gid=131095), generated with kicad-footprint-generator Molex Sabre.

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